What are the pinouts of Thinklink connections?

Thinklink can provide both a 4-conductor connection and a 3-conductor connection, depending on which jack you use on the Thinklink.

For the 4-conductor signal FROM the stethoscope (via the Thinklink):

Tip = stethoscope audio

Ring 1 = stethoscope audio

Ring 2 = ground

Ring 3 = X
 

For the 3-conductor signal FROM the stethoscope (via the Thinklink):

Tip = stethoscope audio

Ring 1 = stethoscope audio

Ring 2 = ground